Grille insert



FIG. 1 is a front perspective view of the grille insert;

FIG. 2 is a left elevational view of the grille insert;

FIG. 3 is a front elevational view of the grille insert;

FIG. 4 is a top plan view of the grille insert;

FIG. 5 is a rear elevational view of the grille insert;

FIG. 6 is a bottom plan view of the grille insert; and,

FIG. 7 is a right elevational view of the grille insert.

The broken lines shown in the FIG. 1 drawing view are for illustrative purposes only and form no part of the claim design. 

The ornamental design for a grille insert, as shown and described. 